... 1. IntroductionThe measuring ranges of the three point caliper gauges are separately 80-130mm. 130~230mm. 230 ... measuring precision is 0.02mm. The three point caliper gauge utilizing math trigonometric function and vernier measuring ... 0.024. Using methodSelect a fit three point caliper gauge according to the O.D to be ... avoid impacting it. (3 point caliper gauge description )Three point digitalcaliper